Football helmet



FIG. 1 is an isometric view of a football helmet, embodying the present design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof. 

CLAIM The ornamental design for a football helmet, as shown and described. 